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Start detection in resisted sprinting : a validity and reliability analysis of encoder- and sensor-based methods
Oskar Cvjetičanin, Matic Sašek, Živa Mesec, Nejc Šarabon, 2026, original scientific article

Abstract: This study evaluated the validity and reliability of start detection methods for determining 5-m sprint time using a resistance device with an encoder. Seventeen recreationally trained participants completed 12 resisted 5-m sprints across two sessions. Sprint start was identified using three encoder-based methods (position, velocity [MEv], and acceleration), a rear-foot release sensor and hip-marker kinematics (KIN) as a proxy for forward center-of-mass displacement. Reliability was evaluated using intraclass correlation coefficient (ICC), coefficient of variation (CV), typical error (TE), standard error of measurement (SEM), and minimal detectable change (MDC), while agreement was examined using Pearson correlations and Bland-Altman analysis. All methods showed moderate to excellent reliability (ICC = 0.54–0.93; CV ≤ 11.1%) and strong agreement with KIN (r = 0.90–0.94). MEv showed the smallest bias (−0.00 ± 0.07 s) and narrowest 95% limits of agreement, and is therefore preferred for sprint start detection in practical settings.
Keywords: resisted sprinting, sprint start, encoder, performance monitorin
Published in RUP: 26.03.2026; Views: 411; Downloads: 17
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Within-session reliability and comparison in resisted sprint performance with the 1080 Sprint between belt and harness attachment points
Matic Sašek, Nicola Reiner Volk, Nejc Šarabon, 2025, original scientific article

Abstract: The application of resistance over the shoulder or hips during resisted sprints could influence performance outcomes but has not been thoroughly investigated. This study examined the within-session reliability of sprint performance measures and compared the outcomes of 1080 Sprint device between belt (hips) and harness (shoulders) attachment. Twelve student-athletes completed three 20 m sprints with resistance equivalent to 25% of body mass (14.0 to 24.7 kg). Sprint split times (5 m, 10 m, 15 m, 20 m), peak velocity, and distance at peak velocity were recorded with 1080 Sprint. Within-session reliability was assessed using intraclass correlation coefficients (ICC3.1) and coefficients of variation (CV), while differences in performance were analysed using paired t-tests and effect sizes (ES). Reliability was excellent for all variables (ICC3.1≥ 0.93; CV ≤ 3.08 %) except distance at peak velocity, which showed poor reliability (ICC3.1≥ 0.32; CV ≥ 17.2 %). Sprint times and peak velocity were faster with the belt attachment (ES ≥ 0.93), while peak velocity was reached earlier with the harness attachment (ES = 0.65). Both attachment points provided reliable measurements, but the belt consistently resulted in faster 20 m sprint performance. Coaches and practitioners should consider these differences when assessing resisted sprint performance or prescribing training to ensure consistent and individualized loading strategies
Keywords: resisted sprint, resistance, sprint performance, speed assessment
Published in RUP: 30.12.2025; Views: 596; Downloads: 0
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Biomechanics of resisted sprint running : doctoral dissertation
Matic Sašek, 2025, doctoral dissertation

Keywords: resisted sprint, hydraulic resistance, sprint acceleration, reliability, biomehanics
Published in RUP: 12.10.2025; Views: 888; Downloads: 48
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